Days earlier than the USA had its first confirmed case of the Omicron variant on Dec. 1 in California, well being officers in Nebraska began looking into six possible instances of coronavirus an infection in a single family, amongst them a 48-year-old unvaccinated man who had just lately returned from a convention in Nigeria.
On Dec. 2, the Nebraska Public Well being Laboratory recognized the Omicron variant because the trigger in all six individuals, who ranged in age from 11 to 48. A examine of the group launched on Tuesday by the Facilities for Illness Management and Prevention instructed that Omicron might have a shorter incubation interval than earlier variants: about 72 hours.
It could take as little as three days for individuals to develop signs, develop into contagious and check constructive, in contrast with 4 to 6 days with Delta infections and people brought on by unique coronavirus, the authors noticed.
Just one member of the family was absolutely vaccinated, and all however one member, together with the traveler, had skilled confirmed infections in 2020. No family members reported underlying medical circumstances.
The study additionally reported that the members of the family skilled delicate signs. The six described their sicknesses as much like, or milder than, these skilled throughout their first an infection.
“It’s unknown whether or not the delicate medical syndromes or differing symptom descriptions are a results of current immunity or altered medical options related to Omicron an infection,” the examine’s authors wrote.
“The 5 reinfections, together with one after full vaccination, is perhaps defined by waning immunity, the potential for partial immune evasion by Omicron, or each.”
A examine in Norway that examined a big cluster of people who have been contaminated with the variant at a Christmas party in Oslo additionally instructed that the incubation interval was round three days. It’s not but clear how lengthy individuals stay infectious with Omicron.